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Expired European patentEurope

Sulfonic acid compound having cyclopentadiene skeleton and composition comprising same and cement

EP 0108654 B1 · Applicant: JAPAN SYNTHETIC RUBBER CO., LTD.

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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Filed September 5, 1983 and granted June 3, 1987. A European patent lasts at most 20 years from filing, so its term ended September 5, 2003.
  • A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by March 5, 2009.
  • We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledSeptember 5, 1983
PublishedMay 16, 1984
GrantedJune 3, 1987
Term endedSeptember 5, 2003
Application numberEP 83401749
Classification (CPC)C04B28/02 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedSep 5, 1983PublishedMay 16, 1984Patent grantedJune 3, 1987Term endedSep 5, 2003

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

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